Here is the full list of all 12 Feeding Frenzy 2: Shipwreck Showdown achievements worth 200 gamerscore.
Awarded for chomping through Time Attack!
Awarded for coming first in a Frenzyfest
Awarded for accumulating 1000 Party Points in Party Games
Awarded for consuming 500 schools or swarms
Awarded for defeating the Intruder and completing the single player story mode
Awarded for eating 5000 fish
Awarded for unlocking all Fish Upgrades in the single player story mode
Awarded for accumulating 3 simultaneous fish shields
Awarded for completing a 'Barracuda Bonus'
Awarded for completing a Quadruple Flip
Awarded for your first fish upgrade in the single player story mode
Awarded for reaching the maximum FRENZY multiplier in a single player game